What's so frustrating is that this is my Linux desktop experience since I have been using it. Clipboards not surviving shutdown where at one point not working, then a bunch of people got together to fix it up and now it's broken again. My Wayland experience is a massive flashback to 2004.
Yes, I know. I remember several years ago being super excited about Wayland. But every time I have tried it, it just falls over in so many different ways. I have given up.
About copy/paste in particular, I have solved it for myself because I work almost exclusively in the terminal and the browser, both of which stay running all the time and therefore acts as a clipboard manager for any copy/paste that happens in it. I am just waiting for my terminal of choice to get support for copy/pasting arbitrary mime types, which its maintainer has said he is going to implement.